Rock Stress Sensitivity and its Influence on Productivity of Overpressured Gas Reservoir: A Case Study in Yinggehai Basin, China
International Journal of Oil, Gas and Coal Engineering
Volume 3, Issue 3, May 2015, Pages: 33-40
Received: Apr. 30, 2015; Accepted: May 20, 2015; Published: Jun. 2, 2015
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Authors
Peng Xiaodong, CNOOC Ltd._ Zhanjiang Research Institute, Zhanjiang, Guangdong, China; Postgraduate, petroleum engineer, engaged in reservoir engineering and reserve evaluation, CNOOC Ltd._ Zhanjiang Research Institute, Zhanjiang, Guangdong, China
Lu Yan, CNOOC Ltd._ Zhanjiang Research Institute, Zhanjiang, Guangdong, China
Liu Xin, CNOOC Ltd._ Zhanjiang Research Institute, Zhanjiang, Guangdong, China
Duan Ce, CNOOC Ltd._ Zhanjiang Research Institute, Zhanjiang, Guangdong, China
Li Zhengjian, CNOOC Ltd._ Zhanjiang Research Institute, Zhanjiang, Guangdong, China
Liu Shijie, CNOOC Energy Technology & Services Ltd. Drilling & Production Company, Tianjin, China
Tong Luyi, CNOOC Ltd._ Zhanjiang Research Institute, Zhanjiang, Guangdong, China
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Abstract
H gas reservoir is an overpressured gas reservoir with high temperature. It is generally believed that overpressured gas reservoir exist stress sensitivity effect due to uncompaction. Firstly, this study conducted lab core test to analysis stress sensitivity of rock by defined confining pressure and decreasing inner pressure. Test results show that the reservoir processes weak to medium stress sensibility. Then, according to mineral composition analysis and strain-stress curve comparison of the cores, stress sensibility is considered to be mainly caused by low hardness clay mineral. Finally, based on well testing data of well H-X-1, we used pseudo-pressure binomial deliverability equation considering stress sensitivity to discuss the influences of stress sensibility on productivity. Results show that the stronger the stress sensibility is, the more obviously productivity decreases. As stress sensibility of the block is weak to medium, it has little impact on productivity.
Keywords
Abnormal High Pressure, Gas Reservoir, Stress Sensitivity, Productivity, Yinggehai Basin
To cite this article
Peng Xiaodong, Lu Yan, Liu Xin, Duan Ce, Li Zhengjian, Liu Shijie, Tong Luyi, Rock Stress Sensitivity and its Influence on Productivity of Overpressured Gas Reservoir: A Case Study in Yinggehai Basin, China, International Journal of Oil, Gas and Coal Engineering. Vol. 3, No. 3, 2015, pp. 33-40. doi: 10.11648/j.ogce.20150303.11
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